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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46e523640f7fe40ec7c8e05eebcde5f9f22c44abe58789930ebdb1b243d7942' 
  AND token = 'MJp//WZkvR1fz9duzbAJvpA8kfuT0WJzEAXE8b02tMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}